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41!
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4.!
Route and dress the timing input cable to the local BITS clock interface and connect per
local practice.
To provide timing relays to one or more additional collocated E7-20 units, you can wire the
E7-20 external timing output interface as described below.
To!wire!the!BITS!timing!output!interface!
1.!
Get up to two 24 AWG shielded 2-wire cables of sufficient length to reach the next E7-
20 shelf. Use one cable to provide a single link (A only), or two cables for a redundant
link (A + B).
Note:
You can use the optional Calix-supplied BITS daisy-chain cable instead. See the
note after Step 4 for installation instructions.
2.!
Strip approximately one inch of insulation from the wire ends.
3.!
Wire the E7-20 external timing output as follows:
a.
!
Connect the timing wires to the E7-20 BITS
OUT (A)
output position:
!
!
Wrap the positive (tip) wire to the
TIP+
pin.
!
!
Wrap the negative (ring) wire to the
RNG-
pin.
b.
!
To provide a redundant timing link to the next E7-20, repeat Step 3a to wire the E7-
20 BITS
OUT (B)
position, as required.
4.!
Route and dress the timing output cable to next E7-20 and connect per the input wiring
procedure above.
Note:
If you are using the Calix-supplied BITS daisy-chain cable, connect the
WW Pins
Out
end to the BITS
OUT
pins on the upstream E7-20 unit, and connect the
WW Pins
In
end to the BITS
IN
pins on downstream unit. Repeat for each additional daisy-
chained E7-20 unit.
